<!DOCTYPE html>
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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!-- <style>
        div{
            width: 500px;
            height: 100px;
            background-color: blue;
        }
        button{
             float: right;
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    <div>
        <button></button>
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    <script>
        const div =document.querySelector('div')
        const button =document.querySelector('button')
        btn.addEventListener('click',function(){
            div.style.display ='none'
        }) -->
    <!-- </script> -->
     <style>
        .box{
            width: 500px;
            height: 600px;
            border: 1px solid ;
            margin: auto;
            text-align: center;
        }
        .box p button{ 
            margin: 50px;
        }
     </style>
     <div class="box">
        <h1>随机问答</h1>
        <span>抽查的人:</span>
       <p>
         <button>开始</button>
        <button>结束</button>
       </p>
     </div>
</body>
</html>